Diaqua­bis(biuretato-κ²O,O′)nickel(II) dichloride

The title compound, [Ni(C₂H₅N₃O₂)₂(H₂O)₂]Cl₂, contains Ni²⁺ cations octa­hedrally coordinated by two bidentate biuret mol­ecules in an O,O′-bidentate coordination mode and two water mol­ecules, the latter in a trans configuration. Two chloride anions provide charge compensation. Numerous N—H...O (mean H...O = 2.17 Å, mean N—H...O = 164° and mean N...O = 2.991 Å), N—H...Cl (mean H...Cl = 2.46 Å, mean N—H...Cl = 162° and mean N...Cl = 3.278 Å) and O—H...Cl (mean H...Cl = 2.19 Å, mean O—H...Cl = 159° and mean O...Cl = 3.068 Å) hydrogen bonds help to stabilize the crystal packing.